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Philips Fidelio X2 with Sound Card + Amp?

For PC, it is better to pick ASUS Xonar Essence STX2, if you wanna use it with headphones.
This soundcard can lift headphones up to 320kOhm without problems and has dolby functions.
 
The fidelio X2 is pretty efficient, 30ohms at 100.0 dB SPL/mW so even a decent phone can get it loud enough to damage your hearing. Do you already have a xonar DX? That will be all you need for this headphone.